Having trouble linking file
For library linking use groups. Let's I show an example:

In library file select all part in your object and press Ctrl+G. And in side T-menu or in F6 set name of the group:



In main scene file add group to the scene. It's like adding object, but you select "group" instead of "object".

After this you will get an empty object with duplication of linked group, that you can move, rotate and scale as a regular object:



And also you will get this instance in add menu: